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IOPC regional director Sarah Green said: "My thoughts are with the young man's family and friends at this most difficult time, as well as all those affected by this tragic incident.

"We were made aware of the man's arrest, and that he had been taken to hospital, on the afternoon of Friday, March 30 and we sent our investigators to the custody suite and to post incident procedures.

"They have been working since that time to gather all the available evidence at this early stage of our investigation.

"We will be offering the man's family regular updates on the progress of our investigation."